Noun

S: (n) duty, responsibility, obligation (the social force that binds you to the courses of action demanded by that force) "we must instill a sense of duty in our children"; "every right implies a responsibility; every opportunity, an obligation; every possession, a duty"- John D.Rockefeller Jr

S: (n) duty (work that you are obliged to perform for moral or legal reasons) "the duties of the job"

S: (n) duty, tariff (a government tax on imports or exports) "they signed a treaty to lower duties on trade between their countries"